Abstract:Transgenic sheep milk containing the protein human alpha 1-Antitrypsin (AAT) was partitioned in Poly(ethylene glycol) (PEG)-Sulphate and PEG-Phosphate biphasic systems. Individual partition coefficients for AAT and some of the milk proteins were determined in these systems. The effects of PEG molecular weight, pH and the inclusion of NaCl on the partitioning of the proteins were also studied. It was found that increasing the concentration of NaCl and decreasing the molecular weight of the PEG resulted in an in… Show more
“…For both proteins, the presence of salt induced a displacement of the partitioning equilibrium to the top phase. This agrees with a salting out effect in the bottom phase that displaces the equilibrium to the PEG-riched phase [21]. This displacement is less marked for ChTRP since the high ionic strength due to the salt presence also induces a displacement of the aggregation equilibrium to the dimer state [20].…”
Section: Thermodynamics Of the Trp And Chtrp Partitioningsupporting
“…For both proteins, the presence of salt induced a displacement of the partitioning equilibrium to the top phase. This agrees with a salting out effect in the bottom phase that displaces the equilibrium to the PEG-riched phase [21]. This displacement is less marked for ChTRP since the high ionic strength due to the salt presence also induces a displacement of the aggregation equilibrium to the dimer state [20].…”
Section: Thermodynamics Of the Trp And Chtrp Partitioningsupporting
“…In our case, although PEG3350/NaCit pH 5.20 systems showed to be the most selective ones, they were expected to lead to poor recoveries (24-26%) due to the low K pTRP values. The addition of certain salts, such as NaCl, has been reported [18] to displace the partitioning equilibrium to the top phase, thus enhancing the protein yield in this phase. Fig.…”
Section: Extraction Of Trp From a Pancreatic Homogenatementioning
“…This system is frequently used in the isolation of several proteins by the partitioning method [10]. The system pH value 5.6 is given by the concentrated ammonium sulfate solution.…”
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